Question

if I am selling an ac for 18000 rs , in loose of 20 percent how much did I pay for it​

Answer 1

Selling Price (SP)=Rs.18000

Loss %=20%

Cost price (CP)=?

We know,

$\: \: \: \: \: \: \: \: \: \: \: \: cp = \frac{100 \times sp}{100 - l}$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{100 \times 18000}{100 - 20}$

$:\implies\sf cp = \cancel{ \dfrac{1800000}{80}}$

Hence your answer is Rs.22500